Ferroelectric Phase Transitions in the System PbTiO3,‐KNbO3,

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Abstract
The formation of a complete series of solid solutions in the system PbTiO3‐KNbO3 was established by X‐ray and dielectric studies. The room‐temperature symmetry of the entire system was tetragonal except for compositions containing more than 96 mole % KNbO3, which had orthorhombic symmetry. The axial ratio, c/a, and the ferroelectric Curie temperature decreased from both the end‐members. The lowest Curie temperature observed in the system was 175°C for the composition with 80 mole % KNbO3. A generalization has been made on the variation of ferroelectric Curie temperatures with compositions in binary systems of perovskitetype solid solutions with and without a common cation.